(eplain.info)Cross-reference hyperlinks

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5.3.5 Cross-reference hyperlinks: definexref, ref
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The 'definexref' destgroup is for the '\definexref' command (Note:
Defining generic references). '\definexref' defines a destination
using the cross-reference label (the first argument) as the hyperlink
label.

   The 'ref' linkgroup includes '\refn' and '\xrefn' (they are
synonyms), '\ref', and '\refs' (Note: Using generic references).

   '\refn' turns the cross-reference it produces into a link, using the
cross-reference label as the hyperlink label. If an optional argument is
present, it is tied by '\reftie' to the reference and become part of the
link.

   '\ref' works similarly to '\refn'. It takes an optional argument,
which is treated the same way as the optional argument to '\refn'. In
addition, '\ref' can produce a "class word". Both the optional argument
and the class word become part of the link, when present. The
cross-reference is tied by '\reftie' to the preceding word. The optional
argument is separated from the class word by '\refspace'.

   Unlike '\ref', '\refs' does not take an optional argument and does
not make the class word part of the link, which is appropriate for its
intended use.